This was a very popular question among the candidates.  Those who answered the question performed well.  Such candidates properly listed the conditions that favour the formation of a delta such as:

-               active vertical and lateral erosion at the upper and middle courses of the river;
-               sediments formed from the upper and middle courses are deposited at the mouth of the river;
-               presence of sheltered, tide-less coast to prevent disappearance of sediments into deep waters;
-               there should be no large lakes in the river course to trap the sediments;
-               there should be no strong current at the river mouth to wash away the sediments.

The types of delta include:

-               arcuate;
-               bird’s foot;
-               estuarine;
-               cuspate.